.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    z-index: 999;

    .wid96 {
      width: 96vw;
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .back_ {
      width: 20vw;
      height: 100%;
      display: flex;
      align-items: center;

      img {
        width: 2.2vw;
        padding-left: 2vw;
      }

    }

    .title {
      display: flex;
      align-items: center;
      justify-content: center;
      height: 48px;
      font-family: PingFangSC-Medium, PingFang SC;
      font-weight: 400;
    }

    .share {
      width: 20vw;
      height: 100%;
      display: flex;
      justify-content: center;
      align-items: center;
    }
  }